"Every time" wrote in message
news:d90243d3-de52-412b-b151-
Several months ago I bought a small cactus plant from my local garden
center ......snip........
Prior to that I'd never watered the
pot at all.



I think you can safely call the red (grafted) one dead.

Cactus plants survive on very little water, but they don't survive on no
water.
http://www.cactuscollection.com/info/cacti/grafted.html



--
Toni
Hills of Kentucky
USDA Zone 6b
http://www.cearbhaill.com